You can do this cheat with Link, Bowser, Fox, Falco, Mewtwo, Pikachu, and Pichu. Choose Fourside as the stage, then choose Bowser to go against. Go to the right side of the building and set the computer players to 3. Get them near the wall, then go in front of the first one that is against the wall. Use your combos (repeatedly press A, but if you're doing it with Bowser, hold B). You should get really high combos.